Revert "New method that allows to work with the entire fid but transforms only part of it. New fft test for that case."

This reverts commit bad440b254b7011a780a8a31697f6c63895abfb6.
Revert "implementation of the FastFourierTransform class and the first test. Deleted some old classes."

This reverts commit a4fa70d4178b02fd709e7e5b5923035200667905.
Revert "new tests for DSPPhaseCorrection class and small corrections to the class"

This reverts commit 137d20a8ae7521981f63666083f8bb6737539b18.